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T.T. Tran(트란 탄 도안),B.H. Nguyen(응우옌 바 히에우),D.H. Kim(김동현) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.11
The accurate prediction of unsteady aerodynamic loads, for floating offshore wind turbines, is still questionable because many methods widely used for this purpose are applied in ways that violate the assumptions of their original formulation. The point of the present study is to conduct unsteady aerodynamic analysis of rotating wind turbine blade considering aerodynamic interference effects due to the periodic platform surge motion of a floating offshore wind turbine. This work was done using several numerical approaches based on both conventional blade element momentum theories and particularly computational fluid dynamics with the overset grid-based approach.
S.J. Hong(홍석진),T.T. Tran(트란 탄 도안),D.H. Kim(김동현),Y.S. Kwak(곽영섭),S.H. Kim(김수현) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.11
Recently, many numerical methods based on potential flow theory have been used to analyze the hydrodynamic effect of a floating body, particularly floating offshore wind turbine. However, conventional potential based methods can not directly and accurately consider the complex viscous interference effects for the motion of multi-structure platform geometry. To accurately account for this effect, it essentially requires additional numerical modification process based on experimental data. This paper deals with unsteady computational fluid dynamic (CFD) analysis of a semi-submersible platform for a floating offshore wind turbine (FOWT) with dynamic motion based on overset grid approach. In this study, a coupled flow and multi-body dynamic analysis has been applied based on the volume of fraction (VOF) approach to investigate the hydrodynamic responses of a typical semi-submersible floater. A mooring system is also considered. It is practically shown that the present results show good correlations with experimental data as it is without any further modification unlike other potential based method.